This was something that appeared in patch 1.05, possibly in an attempt to stop grenade spamming. There is a workaround but it is only applicable for single player or co-op play because it involves editing game files and would get clients kicked from game sevrers for altered game files.

This solution courtesy of No Quarter.

• Extract the \data\sb_templates\sb_weapon_data.xml from patch.bundle

Edit the following lines, changing the 0 to 4.

<var name="gl_clip" type="number" default="0"/>
<var name="spare_gl_clips" type="number" default="0"/>

Now put this file in the \Ghost Recon Advanced Warfighter 2\Local\english folder.

Help with Extracting Bundles Here and Here .

Discussion on this issue here .